ref(cells): silo client renames

[lynnagara]

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[github-actions]

Backend Test Failures

Failures on 0f3a010 in this run:

tests/sentry/silo/test_client.py::SiloClientTest::test_invalid_cell_silo_ip_address — log

tests/sentry/silo/test_client.py:331: in test_invalid_cell_silo_ip_address
    assert err.args == ("Disallowed Region Silo IP address: 172.31.255.255",)
E   AssertionError: assert ('Disallowed ....31.255.255',) == ('Disallowed ....31.255.255',)
E     
E     At index 0 diff: 'Disallowed Cell Silo IP address: 172.31.255.255' != 'Disallowed Region Silo IP address: 172.31.255.255'
E     
E     Full diff:
E       (
E     -     'Disallowed Region Silo IP address: 172.31.255.255',
E     ?                 ^ ^^^^
E     +     'Disallowed Cell Silo IP address: 172.31.255.255',
E     ?                 ^ ^^
E       )

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